[ATR-19253] Add support for nameless feature retreival

Follows on from !24709 (merged)

Allows the user to supply "" for feature name in a call to the Trigger Decision Tool, instead of the default which is "feature". If no string is supplied, all named links of the correct CLID are considered valid and returned to the user. Be they, "feature", "view", "roi", something slice-specific... etc.

Also the try-block had migrated away from the piece of code it was there to protect, moved it back.

Additional: Remove shadowing of the id variable within method and add a missing logical check (which will reduce the output of the fn. while still keeping it valid)